---
phase: "03"
plan: "01"
subsystem: js-toolchain
tags: [typescript, esbuild, vitest, d3]
dependency_graph:
  requires: []
  provides: [js-build-pipeline, ts-type-checking, js-test-runner]
  affects: [assets/, Resources/public/]
tech_stack:
  added: [esbuild, typescript, vitest, jsdom, d3-scale, d3-selection, d3-time, d3-time-format, d3-scale-chromatic, d3-array]
  patterns: [iife-bundle, esm-source]
key_files:
  created:
    - package.json
    - tsconfig.json
    - vitest.config.ts
    - assets/src/heatmap.ts
    - assets/test/heatmap.test.ts
    - Resources/public/heatmap.js
  modified:
    - .gitignore
decisions:
  - "IIFE format with KimaiHeatmap global name for browser compatibility"
  - "ES2022 target with bundler moduleResolution"
  - "jsdom environment for vitest d3 testing"
metrics:
  duration: "3min"
  completed: "2026-04-08"
---

# Phase 3 Plan 01: JS Toolchain Setup Summary

**One-liner:** esbuild + TypeScript + Vitest pipeline for d3 heatmap development with jsdom test environment.

## What Was Done

1. **package.json** -- Created with build/test scripts, installed d3 sub-modules as runtime deps and typescript/esbuild/vitest as dev deps
2. **tsconfig.json** -- Strict TS config targeting ES2022 with bundler module resolution
3. **vitest.config.ts** -- jsdom environment with globals enabled
4. **Placeholder source and test** -- `assets/src/heatmap.ts` stub and passing test in `assets/test/heatmap.test.ts`
5. **.gitignore** -- Added `.phpunit.result.cache`

## Verification Results

- `npm run build` -- Produces `Resources/public/heatmap.js` (537b minified)
- `npm test` -- 2 tests pass (570ms)
- `npx tsc --noEmit` -- No type errors

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 2 - Missing] Added .phpunit.result.cache to .gitignore**
- **Found during:** Task 4 verification
- **Issue:** PHPUnit result cache file was showing as untracked
- **Fix:** Added to .gitignore
- **Files modified:** .gitignore

## Commits

| Task | Commit | Description |
|------|--------|-------------|
| 1-4  | 032b6f8 | feat: add JS toolchain -- esbuild, TypeScript, Vitest |